Yield spread
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In finance the "Yield spread" is the difference between the quoted rates of return on two different investments; a way of comparing any two financial products.
It is a compound of yield and spread.
The "Yield spread of X over Y" simply means the percentage return on investment from financial instrument X minus the percentage ROI from financial instrument Y (per annum).
In simple terms, it is an indication of the risk premium for investing in one investment product over another.